Re-reading, I forgot to answer one ... The CV40 is not filed, I'm no where near an expert, but I think it brings up the 50mm frame lines, and am using the default. I have not taped the frame-line lever, but from memory, the 35mm lines do show then the lever is tripped.
I will comment that I am preferring the look of the 40mm CV to that of my 50mm collapsible summicron.
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